– Discussion: – broad range of forces acts upon the hip joint; – muscles that cross hip joint generate most of the load that it bears; – femoral neck fracture: – distance between the head and shaft of the femur determines the moment arm … Read more
– Discussion: – results from a defect is somatic mutation in the gene coding for alpha subunit of Gs, the G protein that stimulates cAMP formation; – overproduction of cAMP, causes overexpression of c-fos, which regulates proliferation and differentiation of osteoblasts and osteoclasts; – results in … Read more
– Discussion: – child abuse: child abuse occurs in 50-80% of children < 2 yrs w/ femoral frx; – limb length inequality are seldom a problem since frx does not shorten excessively; – acceptable reduction: – in children younger than 2 yrs, shortening of … Read more
– Discussion: – performed to correct either anteversion / valgus deformity of femoral neck in patients w/ dysplasia that reduces w/ abduction and medial rotation; – if hip is not reducible, then open reduction is performed prior to osteotomy; – the procedure is most useful when the acetabular dyspasia … Read more
– See: Total Hip Replacement Menu – Discussion: – design considerations – femoral stem collar – cemented femoral stems (radiology of cemented femoral stems) – press fit femoral stems – femoral component offset – modular neck: – … Read more
– Discussion: – see acetabular component, reestablishment of acetabular floor, and component position; – see: preoperative and post operative radiographic eval – femoral offset is measured from the distance between the center of the femoral head and a line drawn down center of femoral shaft; – note that increasing … Read more
– Discussion: – two sites have been proposed for nail entry: – tip of the greater trochanter and the piriformis fossa; – Entry thru Piriformis Fossa; – main advantage a colinear trajectory with the long axis of the femoral shaft – accurate positioning of the entrace hole is critical. … Read more
– Anatomy: – external rotators of thigh include (from superior to inferior) – Piriformis – conjoined tendons: – Gemellus Superior – Obturator Internus … Read more
– Location of Pin Insertion Sites: – depending on type of frame used, at least two or three pins are placed along iliac wing; – 1st pin is usually placed about 2 cm posterior to anterosuperior spine. – rest of pins should then be placed along iliac crest using … Read more
– See: – External Fixators for Pelvic Frx – Discussion: – see: vascular injuries in pelvic frx; – theory is that the mobile, sharp edges of frx lead to dislodgment of clotted blood and renewed bleeding; – open book pelvic frx (APC II and APC III) are most … Read more